Move up with carbon & Dual-Stage technologyPro Series Reeds combine breakthrough carbon technology withall the advantages of Boyesen"s dual-stage Power Reeds todeliver the largest horsepower and torque gains that any reedsystem can offer-guaranteed. The super-responsive carbon fibertop reed works with the durable fiberglass bottom reed forunrivaled performance. Improves your holeshot Crisper throttle response More overrev for cornering or jumping Extended life over traditional carbon fiber reeds Increased horsepower throughout the powerband